Perhaps you should try some spelling variations:
"qoe estimation algorithms" » "qoe estimation algorithm", "qoe optimization algorithms", "qoe optimisation algorithm", "pose estimation algorithms", "_ estimation algorithms", "cover estimations algorithms"
"qoe optimized algorithms" » "qoe optimizer algorithms", "qoe optimization algorithms", "qoe optimizer algorithmss", "_ optimized algorithms"
"qoe optimized algorithm" » "qoe optimizer algorithms", "_ optimized algorithm"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("qoe optimized algorithm") OR ("qoe optimized algorithms"))) or ("qoe estimation algorithms"))~.
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• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"qoe optimized algorithm\") OR (\"qoe optimized algorithms\"))) or (\"qoe estimation algorithms\"))".
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• Adding a wildcard symbol may retrieve word variants: (((("qoe optimized algorithm") OR ("qoe optimized algorithms"))) or ("qoe estimation algorithms"))*.